java - 如何更改带有拐角半径的形状的背景？

我创建了一个意图，该意图在单击按钮时显示，该意图具有如下所示的形状主题

<shape xmlns:android="http://schemas.android.com/apk/res/android">

    <gradient android:startColor="#4568dc"
              android:endColor="#b06ab3"
              android:angle="45"/>

    <corners android:radius="20dp"/>

</shape>

但是，唯一的问题是拐角半径显示拐角处的白色背景，我该如何摆脱呢？我希望它是透明的。

我也添加了它，但是并没有改变任何角落。

<style name="AppTheme.PopMe">
    <item name="android:windowIsTranslucent">true</item>
    <item name="android:windowCloseOnTouchOutside">true</item>
</style>

添加布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".AddItemActivity"
    android:background="@drawable/popbg">

</android.support.constraint.ConstraintLayout>

表现

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.tester.tester">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".AddItemActivity"
                  android:theme="@style/AppTheme.PopMe"></activity>
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

FloatingActionBar onClick

    public void ShowPopup(View v){

            myDialog.setContentView(R.layout.activity_add_item);

            categorySpinner = myDialog.findViewById(R.id.spinnerCategory);
            ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(getContext(), android.R.layout.simple_list_item_1, getResources().getStringArray(R.array.options));
            spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            categorySpinner.setAdapter(spinnerAdapter);



myDialog.show();
    }

和AddItemActivity

public class AddItemActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add_item);

        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);

        int width = dm.widthPixels;
        int height = dm.heightPixels;

        getWindow().setLayout((int) (width * .8), (int) (height * .8));

        WindowManager.LayoutParams params = getWindow().getAttributes();
        params.gravity = Gravity.CENTER;
        params.x = 0;
        params.y = -20;

        getWindow().setAttributes(params);
    }
}

最佳答案

尝试这个

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">
            <solid android:color="@color/yourColor"/>
            <corners android:radius="7dp"/>
        </shape>
    </item>
</selector>